Brass and Terahertz Stone Massage Tools, Facial Rollers, Double-Headed, GoldenSize: about 56mm wide, 142mm long, 18mm thick.Terahertz is a man-made gemstone that is invented by Japanese scientists in order to protect the body against electromagnetic smog and harmful radiation. What's more, it's an artificial stone called silicon, but terahertz stone has stronger prowess.
